Cut-off device for bag-making machines



May 25, 1925.

Filed Aug- 15, 1923 5 shee-b sheet' 1 nuewtoz May 26, 1925. 1,539,624

T. M. AVERY CUT-OFFJDEVICE FOR BAG-MAKING MACHINES Filed Aug. 15. 1923 s Sheets-Sheet z.

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May 26, 1925. 1,539,624

- T. M. AVERY CUT-OFF DEVICE FOR BAG MAKING MACHINES Filed Aug. 15, 1925 5 Sheets-Sheet 4 May 26, 1925. 1,539,624

T. M. AVERY CUT-OFF. DEVICE FOR BAG MAKING MACHINES Filed Aug. 15, 1923 5 Shegcs-Sheet 5 Snucufoz Hloruci r OFFICE,

fER-Y, OF GLENS FALLS, NEW YORK, ASSIGNOR TO UNION BAG & PAPER LON, OF HUDSON FALLS, NEW YORK, A CORPORATION 01? NEW YORK.

CUT-OFF DEVICE FOR BAG-EIIAKING MACHINES.

Application filed August 15,1923. Serial No. 657,623.

use, ranted June 29, 1915, and adapted to r i s oi the hind having a ioldable at the mouth thereof, such, for notion bags, the being in 1: lengths or sections which are vely cut from a paper tube, the lat 1g made on and fed longitudinally former. The primary object of the iHE LilOYl is to provide novcl and improved wit-oil mechanism for machines of this gena pe whereby each bag length or seche cut oit' from the paper tube smooth edge will be produced on the or flap, as distinguished from the serlied edge heretofore obtained, the smooth edge ot the lip or flap possessing practical ,iuges in the uses of the bags, par- '!l \il1-SI1 they are used as notion bags. result is attained, according to the p not invention, by an improved cut-cl? n, rhunism which, moreover, is capable of operating with rapidity but Without obstruction to the feeding of the paper tube from which the bag lengths or sections are successively cut.

c these land other ends, the invention 'ts in certain improvements andcom- Jinn and arrangements of parts, all as l he hereinafter more fully described, the features of novelty being pointed out pariii-uhirl v in the claims at the end of the HiJil'lll tion. Y l

in the uecon'ipanying drawings:

' re 1 is aside elevation of a paper ilring machine equipped with cut-oil ,ni constructed in accordance with vut invention;

lo :2 represents, on an enlurp l scale, lun view of the improved bag cut-off 2) is a top plan \lPW similar to I but on a larger scale, showing o :edbag cutoff mechanism and the scribed in my prior Patent No. 1,14%,-

cooperating draw and pinch rolls and breaker arm in top plan;

Figure at is a detail perspective view of the cut-off knife which severs the paper tube on the line which forms the edge of the lip or flap at the mouth of the bag;

Figure 5 is a side elevation of the structure shown in Figure 3, showing the elements of the cut-off mechanism in the positions which they occupy at the moment immediately preceding the cutting H op eration; I

Figure 6 is a view similar to Figure but showing the elements of the cut-01f mechanism in the positions which they 0ccupy immediately after the cutting operation has been performed; I

Figures 7, 8 and 9 are diagrammatic views showing the elements of the cut-off mechanism in the positions which they occupy immediately preceding the cutting olt operation, While the cutting 0H operation is being performed, and after the cutting off operation has been completed, respectively; and

Figure 10 is a perspective view of the mouth of a bag having a smooth edged lip or flap as produced by the cut-off mechanism of the present invention.

Similar parts are designated by the same reference characters in the several'figures.

The present invention is applicable gericrally to bag making and similar machines where bug lengths or similar sections are cut successivelyfrom a tube of-paper or similar material so as to form a lip or flap on the bag length or similar section, the edge of which isto be smooth. The preferred embodiment of the invention is shown in the accon'ipanying drawings and will be hereinafter described in detail, but it is to-be understood that the invention is not restricted to the precise construction shown, as equivalent constructions are con'-" teinplated and such will be included Within the scope of the claims,

in the present instance, theinvention is shown applied to a bag making machine adapted for the production of notion bags and the like. such bags being closed at the bot-tom and having sides a and b, the side 7) having its edge 0 terminating at the mouth of the bug and the side r17 having a lip or flap (7 which projects beyond the edge 0 and is l'olduble substantially along'the edge c to close the bag, the edge e of the lip or flap being smooth, as distinguished from a serrated edge like the edgec. The machine asshown in the present instance comprises "a bed or main frame 1 which'su ports at one end any suitable mechanism 2 or forming a continuous paper strip around a former 3 and a fol lingmechanism 4 which may be of any suitable or well known kind for folding and pasting the ends of .the bag sections to close the bottoms of the bags. The improved cut-oft mechanism embodying the present invention receives the paper tube as it is fed along the former 3, it cuts bag lengths or sections from the paper tube, and it delivers the ba lengths or sections to the bottom or end-f0 ding mechanism.

Preferably and as shown in the present instance, the paper tube, designated f is fed continuously and at a suitable s'peedalong the former 3 by a pair of continuously revoluble draw rolls 5 which engage the edges of the paper tube which project beyond the o posite recessed edges 3, of the former 3, t e middle ortions of the rolls 5 being reduced in iameter, as at 6, in order to permit the recessed edges of the former 3 to lie between these rollerswithout eugagc ment therewith. The draw rolls 5 are fixed on shafts 7 which are s'uitably journaled in relatively fixed bearings supported in the frame of the machine, and the shafts are connected by gearing or they are otherwise driven at equal speed but in opposite directions, so that the portions of their peripheries which engage the paper tube will act to advance the aper tube toward the end of the former wgi'ere the cut-off mechanism is located. One of the driving gears 8 for the draw rolls is shown in Figure 2. The end of the former 3 is formed with a 'serrated edge 9 which serves to cut off the" lower wall or stood t along the former 3. is iii-flattened form, an the portion of the former 3 adjacent to its cutting edge 9 is widened to form-a rib 10 which has a width substantially equal tothewidth of the flattened paper tube. A pair of pinch rolls 11 are located beyond the end of the former 3, these pinch rolls being of reduced diameters so that their peripheries do not touch, except wheu'the ribs or segments 1; which project from their peripheries and extend axially of these rolls come into register. The pinch rolls 11 are 1 connected by gearing 13, {or otherwise, so

fed' beyond the end of the former i3.

that they revolve continuously at equal speed but in reverse directions, so that when the .ribs or segments 12 thereon come into register they will pinch or grip and thus hold a Portion of the baper tube which has ii ilcen ms when a paper tube has been fed beyond the end of the former, so that the projecting ply of the paper tube,it beingunderw at the paper tube while feedin tube will be gri ped and held at one side of the cutting e go 9 of the former by the draw rolls 5 and at the other side of'said cutting edge by the pinch rolls 11. At this moment a breaker arm.14 comes into action to sever the lower side or ply of the paper tube along the edge 9 of the former as a, severing or swinging upwardl in performing this-operation. T 1e brea er arm is preferably carried on a disk 15 which is-fixed to ashaft 16, which latter is arranged obliquely to the axes of the draw rolls 5 and the pinch. rolls 11. This shaft, as shown, is mounted in bearings 17 and is driven in appropriately timed relation with the pinch rolls 11 by gearing 18 which connects the shaft 16 to the shaft 19 of one of the pinch rolls, this shaft 19 preferably serving as a main driving shaft for the 1'nachine ,'for which urpose it may be provided with belt pulleys 20, or other suitable driving means. The draw rolls Ffare driven at an ap ropriate speed relatively to the pinch rolls 11 by a suitable means'such as a gear 21 on the shaft of one of the pinch rolls which eooperatcs with an idler gear 22, the latter meshing, in the'present instance, with the gear 8 on the shaft of the lower draw roll The construction and operation of the draw rolls, pinch rolls and the breaker arm may be substantially the same as described in U. S. Patent No. 473,977,granted May 3, 1892. T The shaft 23 which is driven by gearing 24 from the breaker arm shaft 16 is used to drive inking. and imprinting w echanism on the rear of the machine, but s that mechanism constitutes no part of the present invention description thereof is believed to be unnecessary.

The toothed severing edge 9 of the former, in cooperation with the breaker arm 14,

serves, as hereinbefore described, to 'cut or sever the lower side or ply of the paper tube. The present invention provides novel and improved means for cutting or severing the upper wall or ply of the paper tube to form.

the bag lip or flap, the construction and op eration of this cutting means being such that a smooth edge is produced on the lip or flap; Preferably and as shown in the present instance, the cutting means for' the upper 1 wall or ply of the paper tube comprises a knife 25 which conforms in shape with the outline of the edge of the lip or flap to be produced, and tlus knife is presented edgewise to the upper side of the former 3: that is to say the knife stands perpendicularly or substantially so with respect to the plane of the former. The lower ed ge 26 of this knife, which is the cutting edge thereof, is prefer ably herrated in order to facilitate the cutcutting edge, the breaker arm ting or severing operation. The knife may be advai'itagcously constructed from a fiat sheet of steel or other suitable material bent into the roper form and fitted to an appropriately shaped block 27, the knife and block being bolted, or otherwise suitably secured. to an offset portion 28 of a shaft 29. During the cutting operation, the cutting edge 26 of the knife bears edgewise on the upper wall or ply of the paper tube, it being backed by the former 3 contained within the paper tube, and the upward swing of the breaker arm 14 past the cutting edge 9 on the former operates first to sever the lower 'all or ply of the paper tube through the action of the severing. edge 9 on the end of the former, as shown diagrammatically in Figure 8 and substantially coincident therewith the breaker arm 1-1 strikes the upper wall or ply of the paper tube and forces it upward thereby causing said upper wall or ply to be cut by the edge 26 of the knife 25. it being understood that at this time the portions of the tube at opposite sides of the cutting mechanism are held by the draw rolls 5 and the pinch rolls 11'. Owing to the edgewise p esentation of the cutting edge 26 to the upper wall or ply of the paper tube, the cut made by the edge 26 will be a smooth one. as distinguished from the serrated cut made by the edge 9 of the former which lies in a plane substantially coincident with the axis of the paper tube,

in order to enable the knife 25 to operate in the manner described and yet avoid ob-- strut-t ing the feed of the paper tube to bring the next bag length or section into position for cutting. means is provided for shifting the kni fc 25 into contact with the all of the paper tube which is to be cut thereby immediately prior to the cutting operation and for retracting the knife immediately after such cutting operation has been performed. ccording to the present invention, the shaft in which carries the knife 25 on the offset portion 28 thereof is mounted in a position in rear of the forward cutting edge 9 of'the former f} and adjacent to the shaft 16 which forms the axis about which the breaker arm H swings. its ends being mounted to rock in bearings 30 and one end of this shaft has an arm 31 clamped or otherwise fixed thereto. The arm 31 carries a finger 32 which is preferably adjustable longitudinally of the arm 31 and is clamped or secured in adjusted po sition by screws 33. or other suitable means. The linger $12 cotmerates with a cam 34 which is carried on the shaft. of one of the pinch rolls 11. the cam being so shaped and the finger so adjusted that the cam will force the finger 39, downwardly, thereby forcing the cutting edge :26 of the knife into contact with the upper wall or ply of the" paper tube on the former 3. the moment before the brcakcr arm H passes the end of ,sc'ribe it.

the former. and in'nzaidiately after the breaker arm lat has passed the end of the former and hence has completed the cutting operation, the cam 3J4 passes and thus releases the finger 32. so that the latter may swing upwardly, thereby rocking the shaft 29 in a direction to retract the cutting edge 26 from the upper side of the paper tube. A tension spring 35 is preferably ci'mnected to the finger and operates to, hold the finger in engagement with the cum 3- and to retract the cutting edge 26 at the moment the projection of the cam passes the end of the finger. Figure 5 shows the relative position of the parts i'mn'iediately before the cutting operation is performed, and Figure 6 shows the parts in the positions which they assume immediately after the cutting op eration has been completed.

By mounting the shaft'Qf) for the knife on a center which is located in rear of the forward severing edge 9 on the former and toward or adjacent to the shaft 16 which constitutes the center about which the breaker arm 14 swings. the breaker arm and knife will swing. during their operating movements. through arcuate paths which are approximately concentric or parallel. so that the paths of the breaker arm and knife do not intersectiand. in consequence. the knife is enabled to move through a relatively wide range in approaching and receding from the former without interfering with the flight of the breaker arm as the latter passes the knife, and, hence. the knife may be moved away from the former. after each severing operation, an ample distance to clear the aper tube on the former and thus avoid interference with. its advance. Furthermore, the movement of the knife is substantially in the line of travel of the breaker arm; and. in consequence. the cutting of the bag-lip bv the knife isdone more smoothly than if the knife were otherwise mounted,

and the operation of the machine is 1m-- proved.

Each bag length or section severed front the paper tube is received by foider rolls 36 which form part of the bottom end folding mechanism 4 of the machine. This bottom end folding mechanism. however, constitutes no part of the present invention. and hence it is believed unnecessniry to de- As'each severed hag length or section is removedfrolu the cutting meohanism and advanced to the bottom end foiding mechanism. the paper tube is advanced along the former I, preparatory to the cut ting of another hag length or section therefrom. In order to avoid catching of the forward edge of the paper tube on the knife 25 and thereby prevent rising of this edge of the paper tube with the knife when the latter is retracted. it is preferable to provide a stripper plate JET to cooperate with diately after'the knife 25 has beenthus depressed, the breaker arm 14, which re-' V0 the knife 25 whereby the forward edge of the paper tube may be disengaged from the knife 25 as the latter. rises, thereby permitting the paper tube to be advancediwithoutobstruction by such knife.- Preferably and as shown in the present instance, the stripper plate 37 is mounted to extend'across the upper side of the former 3, allowing suiiicient space between it and the upper side of the former tor the passage of the upper wall or ply of the paper tube, and the stripper piate has a recess 38 through which the knife 25 operates, the knife 25 being free to' descend and thus engage the upper wall or ply of the paper tube preparatory to the cutting operation, but when the knife 25 rises the upper wall or ply of the paper tube will be held down by the stripper plate 37, and hence the forward edge of the paper tube will be detached from the-knife. The stripper plate 37 may be supported by its ends 39 which may be bolted or otherwise secured to frame members which support the bearings for the draw rolls 5.

The operation of the severing mechanism constructed as hereinbefore described, is as follows: The paper tube which is made in a continuous length on the former 3 is advanced continuouslyalong the former and toward the severing edge 9 thereof by the draw rolls 5. Thepinch rolls 11 are geared or otherwise driven so that the tube-engaging ribs or segments 12 thereof will pinch orgrip a portion of the paper tube projecting beyond the edge 9 of the former when the paper tube has been fed beyond the former a distance conforming substantially with the length of the bag section'to be severed therefromi Figure 7 shows the parts in the positions which they occupy during the feedingbf' the paper tube. Just before thegripping ribs 11 of the pinch rolls engage the portion of the paper tube projecting beyond the former, the cam 34 acts on the finger 32 to forceit downwardly, whereby the edge 26 of the knife 25 is forced downwardl into engagement with the upper wall or ply of the paper tube on the head 10.0f-the' former, the parts being shown in this, position in Figure/5. Immeves in proper timed relation with the pinch rolls, strikes the paper tube immediately beyond the severing edge 9 of the former, whereby the lower wall orply of the paper tube is severed on this edge 9, as illustrated in Figure 8, immediately after which the breaker arm 14 strikes the upper wall or ply of the tube, thereby causing it "to be cut by the edge 26 of the knife 25.,

A; moment later, thecam 34.- passes beyond the end of the finger 32, thus causing the knife 25 to retract, as shown in Figures 6 and 9, the parts being then ind-position for Paper bags having smooth-edge lips or I flaps possess substantial practical advantages over those having serrated edges, this being particularly true of notion bags and the like, wherein the lip or fla is at the open mouth of the bag and is oldable to close the bag, the smooth edge of the lip or flap avoiding catching of articles thereon while they are being inserted in the bag, and, moreover, there is practically no tendency for the flap to tear. The cut-01f mechanism provided by the present invention is capable of producing such'smooth-edge lips or flaps with speed and facility, and while it is applicable gencraily to bag making machines of various types, t mayappliedeasily and with facility to bag making machines of the well-known type herein shown and referred to. \Vhile the improved cut-01f device provided by the present invention is capable of operating very rapidly with practically no liability to clogging of thcpaper tube in front of the cut-off mechanism, yet if such clogging should occur occasionally, the tube may be easily and quickly restored to prop-- er position and condition, particularly as the offset in the rocker shaft which carries the lip-cutting knife provides ample space for the lI1Stl0Il oft e operators hand to the position of the former in the regionof theopv I on

ward end, means for feeding a paper tube longitudinally on the former, and a device operative to swing in an are past the severing edge on the former to force a portion of the paper tube on the former against said edge, thereby causing said portion of the tube to be severed by said edge, a knife having a cutting edge presented edgewise to the length of the former and mounted to swing toward and from the former on an arc of a.-

circle located within the circle of the arc in which said device swings during its severing operation. I

2. In a former having a. severing edge thereon and means for feeding a paper'tube longitudinab 1y on the former, a knife having a cuttin edge presented trans ersely to one side '0 bag-making machine embodying a the paper tube, and a breaker arm to coact with the tube and cause cutting oi the same against the knife, the breaker arm and knife being mounted to swing on centers which are located at the same side of the severing edge on the former.

3. In a bag-making machine embodying a support for a paper tube, a knife having a cutting edge presented perpendicularlyto one side of the tube, and a breaker arm to coaot with the tube and cause cutting thereof on said knife, the breaker arm and knife being mounted to operate, one past the other, through substantially concentric axes.

4. In a bag-making machine having a support and means for feeding a paper tube longitudinally thereon, a lip-severing knife presented edgewise to a side of the paper tube on the support, and a breaker arm to act on the paper tube to cause severing thereof against the knife, the knife and breaker arm being mounted to operate through arcs having their centers located at the same side of the knife.

5. In a bag-making machine having a former provided with a severing edge on the end thereof, and means for feeding a paper tube longitudinally on the former, a lip-cutting knife having its cutting edge presented edgewise to one side of the former and the paper tube thereon at a point in rear of said severing edge, and a breaker arm mounted to swing about a center located in rear of the severing edge onv the former and operative on a' portion of the tube projecting beyond the former to sever one side of the tube of the severing edge on the former, and to out the other side of the tube against said knife, the knife being mounted to swing about a center located in rear of the severing edge on the former.

6. In a bag making machine embodying a support having a severing edge at its forward end and means for feeding a paper tube longitudinally thereon, a rock shaft extending transversely across said support in rear of its severing edge and having a portion oft-set forwardly toward said edge, a severing knife carried by said forwardly offset portion of said rock shaft and inter mittently movable into engagement with a side of the paper tube on said support, and means operative during the periods of engagement of the knife with said side oi the tube through an arc Whose center is located in rear of the severing edge on the former tr. cause severing of such side of the tube against said knife.

7. In a bag making machine having a former having a severing edge on its for Ward end and means for feeding a paper tube thereon, a knife, a rock shaft extending across the former in rear of said severing edge and. having a forwardly offset portion which carries the knife, means for rocking said shaft to intermittently engage the cutting edge of the knife with a side of the tube on the former, and means to swing on a center located in rear of the severing edge on the former for severing such side of the tube against the knife While the later is in en.- gagement with the tube.

8. In a bag making machine embodying a former, having a severing edge on its forward end, means for feeding a paper tube thereon, and pinch rolls to grip a portion of the tube beyond the former, a rock shaft extending across the former in rear of said severing edge and having its intermediate portion oll'set forwardly toward said edge, a knife carried by said oifset portion of the rock shaft and movable to and from engage ment with a side of the tube on the former by rot trion of the rock shaft, means including a can: on one of the pinch rolls and a eo- 85 operating finger connected to the rock for intermittently moving the cutting edge of the knife into engagement with a, side of the tube on the former, and a breaker mounted to swing about a center located in rear of the severing edge on the former or causing cutting of the tube against the kni :t'e while the later is in engagement "with the tube.

In testimony whereof I have hereunto set my hand.

TRUE M. AVER Y1 

